package object;

public class IntegerDemo {
    public static void main(String[] args) {
        Integer i1 = new Integer(500);
        Integer i2 = new Integer(500);
        System.out.println(i1==i2);
        System.out.println(i1.equals(i2));

        //valueOf()方法会复用1个字节（-128-127）范围内的数据

        Integer i3 = Integer.valueOf(5);
        Integer i4 = Integer.valueOf(5);
        System.out.println(i3==i4);
        System.out.println(i3.equals(i4));

        int i = i4.intValue();
        System.out.println(i);



        int max = Integer.MAX_VALUE;
        int min = Integer.MIN_VALUE;
        System.out.println("int的最大值为："+max+",最小值为："+min);

        long max1 = Long.MAX_VALUE;
        long min1 = Long.MIN_VALUE;
        System.out.println("int的最大值为："+max1+",最小值为："+min1);



        String s1 = "39";
        int age = Integer.parseInt(s1);
        System.out.println(age);

        String s2 = "123.456";
        double price = Double.parseDouble(s2);
        System.out.println(price);


//        Integer i = 5;
//        int j = i;
//

    }
}
